/**
  ******************************************************************************
  * @file    USB_Device/MSC_Standalone/Src/usbd_storage.c
  * @author  MCD Application Team
  * @brief   Memory management layer
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2015 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under Ultimate Liberty license
  * SLA0044, the "License"; You may not use this file except in compliance with
  * the License. You may obtain a copy of the License at:
  *                      www.st.com/SLA0044
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------ */
#include "usbd_storage.h"
#include "DevicesDisk.h"

/* Private typedef ----------------------------------------------------------- */
/* Private define ------------------------------------------------------------ */
#define STORAGE_LUN_NBR                  1
#define STORAGE_BLK_NBR                  DISK_BLOCK_COUNT
#define STORAGE_BLK_SIZ                  DISK_BLOCK_SIZE

/* Private macro ------------------------------------------------------------- */
/* Private variables --------------------------------------------------------- */
__IO uint32_t writestatus, readstatus = 0;

/* USB Mass storage Standard Inquiry Data */
int8_t STORAGE_Inquirydata[] = {  /* 36 */
  /* LUN 0 */
  0x00,
  0x80,
  0x02,
  0x02,
  (STANDARD_INQUIRY_DATA_LEN - 5),
  0x00,
  0x00,
  0x00,
  'S', 'T', 'M', ' ', ' ', ' ', ' ', ' ', /* Manufacturer: 8 bytes */
  'P', 'r', 'o', 'd', 'u', 'c', 't', ' ', /* Product : 16 Bytes */
  ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ',
  '0', '.', '0', '1',           /* Version : 4 Bytes */
};

/* Private function prototypes ----------------------------------------------- */
int8_t STORAGE_Init(uint8_t lun);
int8_t STORAGE_GetCapacity(uint8_t lun, uint32_t * block_num,
                           uint16_t * block_size);
int8_t STORAGE_IsReady(uint8_t lun);
int8_t STORAGE_IsWriteProtected(uint8_t lun);
int8_t STORAGE_Read(uint8_t lun, uint8_t * buf, uint32_t blk_addr,
                    uint16_t blk_len);
int8_t STORAGE_Write(uint8_t lun, uint8_t * buf, uint32_t blk_addr,
                     uint16_t blk_len);
int8_t STORAGE_GetMaxLun(void);

USBD_StorageTypeDef USBD_DISK_fops = {
  STORAGE_Init,
  STORAGE_GetCapacity,
  STORAGE_IsReady,
  STORAGE_IsWriteProtected,
  STORAGE_Read,
  STORAGE_Write,
  STORAGE_GetMaxLun,
  STORAGE_Inquirydata,
};

/* Private functions --------------------------------------------------------- */

/**
  * @brief  Initailizes the storage unit (medium)       
  * @param  lun: Logical unit number
  * @retval Status (0 : Ok / -1 : Error)
  */
int8_t STORAGE_Init(uint8_t lun)
{
    return (USBD_OK);
}

/**
  * @brief  Returns the medium capacity.      
  * @param  lun: Logical unit number
  * @param  block_num: Number of total block number
  * @param  block_size: Block size
  * @retval Status (0: Ok / -1: Error)
  */
int8_t STORAGE_GetCapacity(uint8_t lun, uint32_t * block_num,
                           uint16_t * block_size)
{
    *block_num  = STORAGE_BLK_NBR;
    *block_size = STORAGE_BLK_SIZ;
    return (USBD_OK);
}

/**
  * @brief  Checks whether the medium is ready.  
  * @param  lun: Logical unit number
  * @retval Status (0: Ok / -1: Error)
  */
int8_t STORAGE_IsReady(uint8_t lun)
{
    return (USBD_OK);
}

/**
  * @brief  Checks whether the medium is write protected.
  * @param  lun: Logical unit number
  * @retval Status (0: write enabled / -1: otherwise)
  */
int8_t STORAGE_IsWriteProtected(uint8_t lun)
{
    return (USBD_OK);
}

/**
  * @brief  Reads data from the medium.
  * @param  lun: Logical unit number
  * @param  blk_addr: Logical block address
  * @param  blk_len: Blocks number
  * @retval Status (0: Ok / -1: Error)
  */
int8_t STORAGE_Read(uint8_t lun, uint8_t * buf, uint32_t blk_addr, uint16_t blk_len)
{
    cDiskRead(blk_addr * STORAGE_BLK_SIZ, buf, blk_len * STORAGE_BLK_SIZ);

    return (USBD_OK);
}

/**
  * @brief  Writes data into the medium.
  * @param  lun: Logical unit number
  * @param  blk_addr: Logical block address
  * @param  blk_len: Blocks number
  * @retval Status (0 : Ok / -1 : Error)
  */
int8_t STORAGE_Write(uint8_t lun, uint8_t * buf, uint32_t blk_addr, uint16_t blk_len)
{
    cDiskWrite(blk_addr * STORAGE_BLK_SIZ, buf, blk_len * STORAGE_BLK_SIZ);

    return (USBD_OK);
}

/**
  * @brief  Returns the Max Supported LUNs.   
  * @param  None
  * @retval Lun(s) number
  */
int8_t STORAGE_GetMaxLun(void)
{
  return (STORAGE_LUN_NBR - 1);
}

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
